Have a Macbook pro question regarding display/screen size

[CloudWatcher]

1. it depends :)

If it's Safari that's making things bigger, then CMD + or CMD - can be used to make things bigger and smaller. Also Safari preferences, web sites, page zoom might have something for you to clear.

Also in Safari, control click on the toolbar to customize it and add the "aA" control (really small-A and big-A) to increase/decrease the size.

But maybe it's also the accessibility "zoom" stuff ... I don't know about you, but my eyes are less than great. I've enabled "control scroll" as a zoom-in and zoom-out feature so I can quickly zoom into a part of the screen that's hard to see. The setting for this is in system-preferences, accessibility, zoom.